Gamochaeta purpurea
Gamochaeta chionesthes
purple everlasting-cudweed, spoon-leaf cudweed, spoon-leaf purple everlasting
snow-white everlasting, white-cloaked cudweed
erect to decumbent-ascending, densely but loosely pannose or pannose-tomentose.
erect to decumbent-ascending, not pannose (indument whitish, like closely appressed, polished cloth, hairs usually not individually evident).
basal and cauline, basal and proximal cauline usually withering before flowering;
blades oblanceolate to spatulate, 1–6 cm × 5–14 mm (distal similar, at least among proximal heads, margins sometimes sinuate), faces usually bicolor, abaxial closely white-pannose, adaxial usually sparsely arachnose (basal cells of hairs persistent, expanded, glassy), sometimes glabrescent.
basal and cauline, basal present through flowering, blades oblanceolate to oblanceolate-spatulate, 2–6(–7) cm × 5–13 mm (gradually smaller, becoming linear bracts distally), faces bicolor, abaxial closely white-pannose, adaxial sparsely arachnose (light green, hairs persistent, closely appressed, nearly microscopic).
turbinate-cylindric, 4–4.5 mm, bases sparsely arachnose.
cylindro-campanulate, 3.5–4 mm, bases sparsely arachnose.
bisexual 3–4; all corollas usually purplish distally.
bisexual 2–4; all corollas brownish yellow to purple distally (sometimes purple only on adaxial faces of lobes in bisexual corollas).
in 4–5 series, outer ovate-triangular, lengths 1/3–2/3 inner, apices acute-acuminate, inner triangular-lanceolate (usually striate), laminae purplish (in bud) to whitish or silvery (in fruit), apices acute (not apiculate).
in 4–5 series, outer ovate, lengths 1/3 inner, apices acute to acute-acuminate, inner oblong-lanceolate, laminae (± striate) purplish (at stereome and on distal margins or not at all), apices acute to acute-acuminate (not apiculate, slightly flaring outward in fruit).
initially in continuous spiciform arrays 1–4(–5) cm × (5–)10–15 mm, later interrupted (glomerules widely separated, bracteate, the proximal often on relatively long peduncles).
initially in ± continuous, cylindric arrays 3–5(–7) cm × 10–12 mm (pressed), later sometimes interrupted and 7–20 cm (producing axillary glomerules from proximal nodes).
(tan) 0.6–0.7 mm.
(purple) 0.5–0.6 mm.
= 14, 28.
Gamochaeta purpurea
Gamochaeta chionesthes
Gamochaeta purpurea apparently is native to North America and adventive elsewhere.
Basal cells of hairs on adaxial faces of leaves are expanded and glassy (versus hairs filiform to bases in most other species) and are diagnostic for Gamochaeta purpurea. From Maryland northward, plants of G. purpurea produce relatively small basal rosettes and relatively shallow fibrous roots or a filiform taproot; southward and southwestward, the basal rosettes often are larger and the fibrous roots are denser.
Gamochaeta purpurea apparently occurs widely through the world as a weed; it is fairly clearly native to eastern North America, where it is the least weedy of the gamochaetas. Plants of G. purpurea in southern Arizona along perennial streams at the base of the Santa Catalina Mountains were first collected in 1903 (G. L. Nesom 2004) and were, perhaps, accidentally established through visitation; the same sites are heavily infested by other, more aggressive, nonnative species. Collections of G. purpurea also have been made at higher elevations in the Santa Catalina, Rincon, and Chiricahua mountains, where the species is less likely to have been introduced by human activity. It also seems unlikely that plants in scattered Mexican localities were introduced there by human activity.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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